v1.0.3-opendoor: Add optional clusterName to splunk-kubernetes-objects

Once it's been added to metrics as well, this config should probably be
moved to a global value

Splunk Connect for Kubernetes with cluster names

Merge pull request #2 from opendoor-labs/shaun/typo

Fixing typo with cluster where it was cluser.

Fixed a typo.

v1.0.2.1

Fixing typo

Added cluster_name to the fields

Merge pull request #1 from opendoor-labs/allan/cluster-name

Adding an optional clusterName value in order to have the ability to filter by a cluster_name field in splunk.